Shuttle for sewing-machines.



, F. KULHAWY.

SHUTTLE FOR SEWING MACHINES.

APPLI( ;ATION ILED MAR. 6. I916.

Patented Dec. 12, 1916.

wuewfoe FEQDINAND KULHAWY rm: mmms rum: ca more uma" wAsnmur-m. p. c.

FERDINAND KULI-IAWY, OF NEW YORK, N. Y.

SHUTTLE FOR SEWING-MACHINES.

Specification of Letters Patent.

Patented Dec. 12, 1916.

Application filed March 6, 1916. Serial No. 82,366.

To all 10 7mm it may concern.

Be it known that I, FERDiNAND KULIIAWY, subject of the Czar of Russia, residing at New York, in the county and State of New York, have invented certain new and useful Improvements in Shuttles for Sewing-Machines, of which the following is a specification.

This invention relates to a shuttle for sewing machines and has as its principal object to provide an improved form of interlocking connection between a bobbin case and the support therefor in which the bobbin case is securely held in the support, but easily removable therefrom for the purpose of supplying a new thread spool or bobbin.

With the foregoing and other objects in view, the invention consists in the particular construction, combination and arrangement of parts hereinafter more specifically described and shown in the accompanying drawing, in which:

Figure 1 is a perspective view of the bobbin case and the support, separated from each other, showing how they are held in the hands in the process of inserting the former into the latter. Fig. 2 is a plan view of the above mentioned two parts in their interlocked position. Fig. 3 is a sectional view taken on the line 33 of Fig. 2, looking in the direction indicated by arrows. Fig. 4 is an end view of the shuttle composed of the bobbin case and its support, showing two fingers in the act of withdrawing the former from the latter.

The same part is designated by the same reference character throughout the different views.

Referring more particularly to the drawing, 5 is the support of the bobbin case 6, into which the latter fits and is adapted to be removably inserted. It has the form of a shell, as best seen in Fig. 1, and is pro vided near its bottom with a rod 7 rigidly mounted therein. The two holes 8 serve only for the purpose of reducing the weight of the support 5.

The bobbin case 6 is of cylindrical form, one end 9 of which is entirely open and the other end, 10, closed, an opening 11 being provided therein to enable the operator to push out, with a finger inserted through it,

the bobbin or spool 12 consisting of two circular heads and a hollow shaft 13 connecting them, the latter being rotatably carried by the solid shaft 14 rigidly mounted in the end 10 of the bobbin case 6. The parts described in this paragraph do not constitute a vital part of the present invention and are therefore only indicated with a view to the better understanding of the drawing. The same refers to a spring plate 15 mounted on the bobbin case 6 and secured thereto by a set screw 16 by means of which its tension may be regulated, in accordance with the different thicknesses of thread, 17, used.

On the bottom part of the bobbin case 6 is formed a pair of brackets 18 in which is pivotally mounted a cam lever 19, on a pin 20 provided with a coil spring 21 tending to keep the longer arm of the cam lever 19 closed against the body of the bobbin case 6. A groove 22 is also formed at the bottom of the bobbin case 6, into which the rod 7 fits when the bobbin case is inserted into the support 5 and the short arm of the cam lever 19 looks it in there in the normal position of the parts just described, as is obvious from the drawing. The locking occurs automatically in the process of insertion, the rod 7 pushing the short arm of the cam lever 19 out of the way, when pressed against it, and the spring 21 returning it again, when the rod 7 lies in the groove 22. In order to unlock the rod 7 from the groove 22, the long arm of the cam lever 19 has to be lifted with the fingers, as shown in Fig. 4c, whereupon the bobbin case may easily be removed from the support, as shown. A hole 23 is provided in the long arm of the cam lever 19 through which the screw 16 may be reached, with a screw driver, for the purpose of regulating it.

I claim:

1. In a shuttle for sewing machines, the combination of a bobbin case, a holder therefor, a rod provided in said holder, a groove provided in said bobbin case, into which said rod fits, and a cam lever carried by said bobbin case, adapted to lock said rod in said groove, substantially as and for the purpose set forth.

2. In a shuttle for sewing machines, the combination of a bobbin case, a holder theresaid groove by means of said cam lever,

In testimony whereof, I aflix my signature 1n the presence of two Witnesses.

FERDINAND KULHAWY.

Witnesses:

M. GODDARD, JOSEPH KOVARIK.

substantially as and for the purpose set forth.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C, 

